Github user MasterDDT commented on the issue:
https://github.com/apache/spark/pull/17400
Here is a sort example:
```
scala> val df1 = Seq((1, 2), (3, 4)).toDF("a", "b").sort("a")
df1: org.apache.spark.sql.Dataset[org.apache.spark.sql.Row] = [a: int, b:
int]
scala> val df2 = df1.selectExpr("a as newA", "b")
df2: org.apache.spark.sql.DataFrame = [newA: int, b: int]
scala> println(df1.join(df2, df1("a") ===
df2("newA")).queryExecution.executedPlan)
*SortMergeJoin [args=[a#37119], [newA#37125],
Inner][outPart=PartitioningCollection(8, hashpartitioning(a#37119,
8)%NONNULL,hashpartitioning(newA#37125, 8)%NONNULL)][outOrder=List(a#37119
ASC%NONNULL)][output=List(a#37119:int%NONNULL, b#37120:int%NONNULL,
newA#37125:int%NONNULL, b#37136:int%NONNULL)]
:- *Sort [args=[a#37119 ASC], false, 0][outPart=HashPartitioning(8,
a#37119:int%NONNULL)][outOrder=List(a#37119
ASC%NONNULL)][output=List(a#37119:int%NONNULL, b#37120:int%NONNULL)]
: +- Exchange [args=hashpartitioning(a#37119,
8)%NONNULL][outPart=HashPartitioning(8,
a#37119:int%NONNULL)][outOrder=List()][output=List(a#37119:int%NONNULL,
b#37120:int%NONNULL)]
: +- *Sort [args=[a#37119 ASC], true, 0][outPart=RangePartitioning(8,
a#37119 ASC%NONNULL)][outOrder=ArrayBuffer(a#37119
ASC%NONNULL)][output=List(a#37119:int%NONNULL, b#37120:int%NONNULL)]
: +- Exchange [args=rangepartitioning(a#37119 ASC,
8)%NONNULL][outPart=RangePartitioning(8, a#37119
ASC%NONNULL)][outOrder=List()][output=List(a#37119:int%NONNULL,
b#37120:int%NONNULL)]
: +- LocalTableScan [args=[a#37119,
b#37120]][outPart=UnknownPartitioning(0)][outOrder=List()][output=List(a#37119:int%NONNULL,
b#37120:int%NONNULL)]
+- *Sort [args=[newA#37125 ASC], false, 0][outPart=HashPartitioning(8,
newA#37125:int%NONNULL)][outOrder=List(newA#37125
ASC%NONNULL)][output=ArrayBuffer(newA#37125:int%NONNULL, b#37136:int%NONNULL)]
+- Exchange [args=hashpartitioning(newA#37125,
8)%NONNULL][outPart=HashPartitioning(8,
newA#37125:int%NONNULL)][outOrder=List()][output=ArrayBuffer(newA#37125:int%NONNULL,
b#37136:int%NONNULL)]
+- *Project [args=[a#37135 AS newA#37125,
b#37136]][outPart=RangePartitioning(8, a#37135
ASC%NONNULL)][outOrder=ArrayBuffer(a#37135
ASC%NONNULL)][output=ArrayBuffer(newA#37125:int%NONNULL, b#37136:int%NONNULL)]
+- *Sort [args=[a#37135 ASC], true,
0][outPart=RangePartitioning(8, a#37135
ASC%NONNULL)][outOrder=ArrayBuffer(a#37135
ASC%NONNULL)][output=List(a#37135:int%NONNULL, b#37136:int%NONNULL)]
+- Exchange [args=rangepartitioning(a#37135 ASC,
8)%NONNULL][outPart=RangePartitioning(8, a#37135
ASC%NONNULL)][outOrder=List()][output=List(a#37135:int%NONNULL,
b#37136:int%NONNULL)]
+- LocalTableScan [args=[a#37135,
b#37136]][outPart=UnknownPartitioning(0)][outOrder=List()][output=List(a#37135:int%NONNULL,
b#37136:int%NONNULL)]
```
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